Yeah, it would’ve been 2010 for me too. Unfortunately, my illness is progressive, so the 2018 story is a lot different. So it goes. But candles aren’t an option at our house.
By the way, for anyone who is interested, there is a page in the community – created wiki on devices that work with both HomeKit and smartThings. There aren’t many, but there are some, so that Gives you more flexibility as well since Siri can run over cellular even if the Internet is out and everything else runs locally for HomeKit.
Actually I came home today to 2 of my Google Homes soft bricked and needed to be factory reset because they couldn’t find the network, even after going into settings in the Google Home app. Maybe it’s not as way-out-there as you think.
BTW, The new ADT/Smartthings security panel has some significant improvements in this area, but only for the dual logo devices that are authorized to notify the ADT monitoring center.
Those specific functions do operate locally and have their own cellular communication module. And you can arm or disarm it even when the SmartThings cloud is down.
It doesn’t help you with the lights or the thermostat, but as far is the security functions, it won’t run into this particular issue.